Abstract
Human beings have been using metals since the bronze age because of their unique optical, mechanical and physical properties, which originate from itinerant electrons. In this article, we introduce basic models to describe itinerant electrons in metals. We also introduce optical spectroscopy techniques and spectrum analysis methods that can be used to study the optical properties of metals. We hope that our article will be helpful for researchers using optical spectroscopy techniques in the field of metals and anyone who is interested in the optical properties of metals.
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